[kh99]

The response about registering was meant for vb version 4. The fetch_template() code isn't something you need in this case. My guess is that the place where you set $captitle is inside a function so it's not a global, and not in scope when the template is rendered. Which template are you trying to change, and which hook location did you use for your plugin?

If my guess is right, you could try this:

global $captitle;
$captitle = $thread['title'];

Edit: another thing that should work (although it's cheating, a bit):

$thread['captitle'] = ucwords($thread['title']);